- The United States Department of Agriculture (USDA), National Agricultural
Statistics Service (NASS): http://www.nass.usda.gov/QuickStats/Create_Federal_All.
jsp. - Gold sales cost Europe’s central banks $40bn - By Javier Blas in London,
Published: May 6 2009 23:FT.com, May 6, 2009. - World Gold Council; Gold Research and Statistics web site: http://www
.research.gold.org/reserve_asset/.
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